Anchor-lock for building structures.



L. R. ZIFFERER.

ANCHOR LOOK FOB BUILDING STRUCTURES.

APPLICATION FILED DBO. 26, 1907.

Patented Dec. 2,1, 1909.

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Arr Nev WITNESSES:

UNTTED sTATns PATENT caricia] Q LOTHAR R. ZIFFERER, OF SAN FRANCISCO, CALIFORNIA.

ANCHOR-LOCK FOR BUILDING STRUCTURES.

Specification of Letters Patent. Patented Dec, 21, 1909,

Application filed December 26, 1907. Serial No. 407,991.`

T o all whom it Imay concer/n:

Be it known that l, Lo'rlmn R. Zirrnnnn, citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Anchor-Locks for Building Structures, of which the following is a specification.

My invention relates to a locking device for the attachment of fixtures to concrete or other walls of buildings.

It consists in the combination of parts, and in details of construction which will be more fully explained by reference to the accompanying drawings, in which- Figure is a view showing a section of wall or ceiling, with my attachment in position and ready to expand. Fig. 2 is a sectional view` of the same expanded and Fig. 4 1s a locked. Fig. 3 is an end view. perspective View of one of the half members of the segment. Fig. 5 is a side sectional view of the same. Fig. 6 is a transverse section taken through the line aJ-a' of Fig. 4. Fig.l 7 is a similar section on the line y-g/ of Fig. 4. Fig. 8 shows the nut in position at the inner end of the half shell. Fig. 9 shows the nut when drawn to the outer end of the shell.

It is the object of my invention to provide a means for locking fixtures of any description firmly into a brick, concrete, or other wall made of a material which is liable to crumble and allow fixtures to become loosened.

As shown in the present drawings, A-A are two segments which when placed together form a complete shell, the segments meeting on the line Q. These segments have the interior made hollow, and the inner end has a hole 7 of such size as to receive and guide a bolt 3 which may be an ordinary standard bolt.

The interior of the shell sections are made of such form as to receive a hexagonal nut l, and allow it to be advanced upon the screw-bolt 3 without turning within the shell. In order to expand the shells and causethem to lock within the hole, the interior sides lt which form the opposing bottom of the shells, are mare to converge from the inner to the outer end, as shown in Figs. 1 and 2, and thel corresponding sides of the nut, sliding upon these surfaces, when the nut is advanced by turning the bolt, will cause the shells to separate from each other, and their exterior surfaces to bind in the hole in which the device is placed. Upon these exterior surfaces, and in line with the inclined surfaces t, are formed teeth or serrations 5. These teeth have a broad base where they unite with the surfaces of` the shell segments, and taper to a point when viewed transversely; this structure, serving as a reinforce to Strengthen the` shells at the angles of the surfaces 4. The serrations are so made that the outside line of the teeth is substantially parallel with the axis of the shells. f

In order to expand the device and lock it in position, I have shown a nut 6 threaded to fit the bolt, with its periphery fitted to slide upon the interior inclined surfaces 4. The inner-.end of thev bolt 3 isguided and turnable in the hole 7 which is made in that end of the shell; and the outer part of the bolt passes through the hole in the outer` end of the shell. The head 8 of the bolt abuts against the outer end of the artto be secured, and when turned it wil advance the nut 6 within the shell.

The device is assembled as follows; A hole of' the proper diameter and depth having been made where the attachment is to be placed, the nut may be introduced into the segments. The seg-ments A--A4 may then be pushed to the bottom of the hole, or as far as may be desired. The nut- 6 being at the inner end of' the shell, will allow the segments to be closed sufficiently to enter the hole, and the nut to lie in the channel between the surfaces 4. The bolt 3 may then be turned, and the nut caused to travel along the hollow interior of the shells s0 that the nut 6 will act against the convergent channels, and force the shells A-A outwardly so that the teeth 5 upon the outside will eno'age with the interior of the opening in which the fixture is to be placed, and lock it firmly in place.

An important feature of this construction is that the outward pressure is always in the transverse plane of the nut, always keeping pace with the travel of the nut, and there will be no leverage'tending to bend or dis tort the shells, as will be produced if the shells are united at one end, and an expander caused to travel within them.

As the points of the teeth 5 are substantially parallel with the interior surface of Athe opening, itiwill be seen that theyw'ill be forced to engage evenly, and thus lock the shell for its whole length. Any'desired attachments may be made to I the projecting ends of the vbolt 6 that are desired, and in case of any loosening of the parts, it 1s only necessarygto give the bolt 3 a turn or two to again lock them firmly in place. t t t It will be seen that this construction enables meto use standard bolts and nuts obtainable in any hardware store, and that by reversing the bolt so that thev hexagonal 'the like, a shell 'composed of two opposed members separated in a plane through the axis of the complete shell, said shell having a hexagonal interior, the opposed surfaces of which approach each other from the rear toward the front and eachI of which surfaces has an equal width from end to end, and the surfaces which meet the dividing -line being convergent, a bolt guided and turnable longitudinally within the shell, a hexagonal nut upon said bolt, two opposed sides of Iwhich are adapted to travel upon the equal interior and opposed surfaces ofv the shells whereby said shells are separated and caused to bind within an inclosing hole.

2. In a device of the character described,

i a Ihollow shell composed of two segments having the edges meeting in a plane through the longitudinal axis of the shells, each se nient having toothed exterlor surfaces mi Way between the meeting edges, and having a hexagonal interior, the two sides which correspond wlth the toothed surfaces inclining toward each other from the rear to the front and eachof which sides is of equal width from end to end, and the sides which register with the vmeeting edges of the shells being convergent from one end to the other, a hexagonal nut tting said shells having the sides of a length corresponding with the two straight' interior sides'whereby the nut may benioved from end to end without binding, said nut acting to separate the shells and cause the exterior teeth-'to bind -in a containing chamber, anda screw-threaded bolt passing through the nut and adapted when turned to draw the nut from the wider to the narrower end, and cause the members of the shell to be separated.

j 3. In a device of the character described, segmental hollow shellshaving the interior hexagonal with the sides which, correspond with the meeting edges of the shells made tapering, and the opposing sides approaching each other from the rear to the front and having the edges parallel from end toend, a nut slidable and guided within the shells, a screw-threaded bolt extending axially through the nut and shells, and adapted to draw the nut outwardly and expand the shells, teeth formed upon the exterior of the shells corresponding with the straight interior sides, said teeth having broad reinforcing bases convergent to their points, and adapted to engage the interior of the chamber in which the shells are fitted.`

i l. An anchor lock including half shells with opposed serrated projections upon the backs of said shells, longitudinal interior channels, the bottoms of which have parallel edges and correspond in position with the 'exterior teeth, said shells being gradually thickened from one end yto the other to correspondinglyl decrease the depth of the channel, -a nut, two opposed sides of which fit and travel upon the inclined bottoms, and a threaded screw passing through the nut and turnable to advance the nut and separate the shell sections.

y In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

- LOTHAR R. ZIFFERER.

" lVitnesses: i JAMES MAsoN, CHARLES A. PENFIELD. 

